Pile Installation below a Settlement-Sensitive Bridge
Publication: Ports 2010: Building on the Past, Respecting the Future
Abstract
This paper presents a case history of the Berth M project on Pier 91 at the Port of Seattle. This project consisted of reconstructing 64 meters (210 feet) of apron structure. Berth M was the last timber apron on Pier 91 to be reconstructed and replaced with new concrete apron. It had not been replaced earlier due to design and construction challenges related to its proximity to a nearly 80-year-old settlement-sensitive bridge, which is the primary arterial to a large residential neighborhood. Although design of a replacement bridge was underway due to deterioration and seismic vulnerability of the current structure, the Port's schedule for opening the new Smith Cove Cruise Terminal on Pier 91 required Berth M to be reconstructed before the bridge was replaced. The project team developed a creative foundation design that included five different pile types, optimizing their use based on each pile's specific location and function. The advantages and disadvantages of each pile type and a description of their use on this project are discussed in this paper. The designers recommended a deflection and vibration monitoring program during construction because of the project's close proximity to the bridge. This program included stringent monitoring of any pile driving or demolition (e.g., timber pile extraction) located within 15 meters (50 feet) of bridge foundation supports. Monitoring data shows the influence of pile driving on settlement and peak particle velocity at various locations within or near the site. This project was successfully completed in 2008.
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Copyright
© 2010 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
ASCE Technical Topics:
- Bridge design
- Bridge engineering
- Bridges
- Construction engineering
- Construction industry
- Construction management
- Design (by type)
- Engineering fundamentals
- Foundation settlement
- Foundations
- Geotechnical engineering
- Infrastructure construction
- Pile foundations
- Pile settlement
- Piles
- Project management
- Structural engineering
- Structural settlement
- Wood piles
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